senior java full stack developer jobs in London

Senior Java Developer (AWS, Microservices)Travel - Sussex Daily rate: £550 - £700 (inside IR35) Duration: 3 - 6 months Hybrid: 1 - 2 days Start: ASAPMy new client is looking for a Senior Java Developer (AWS, Microservices) to join the team on a contract basis. You will play a key role in designing, developing, and maintaining secure, scalable, and...

Hybrid- London 3 days per week in the office (Mandatory) We’re looking for Senior Java Developers to join a high-performing engineering team working on a major financial services project in London. This is a hands‑on engineering role for developers who care about clean, maintainable code, automated testing and continuous delivery. You’ll work in a...

Kate Matthews Solutions is actively seeking mid to senior level Java Developers to join a fast-growing FinTech in the UK. This role centers on rebuilding the tech stack using Kafka and Kafka Streams to create a scalable backbone for rapid growth.You will solve real-world problems in small, agile, cross-functional teams, focusing on large-scale distributed...

Senior Full-Stack Engineer - Credit Cards Hybrid in London, United Kingdom We’re looking for a Senior Full-Stack Engineer. You’ll build features on iwoca’s business credit card and own each one from the first line of code to the moment a customer makes their first spend. The company Small businesses move fast. Opportunities often don’t wait, and...

Senior Full-Stack Engineer – Certifications Full-time, remote. Join TryHackMe as a Senior Full-Stack Engineer on our Certifications Squad! TryHackMe is the fastest growing online cybersecurity training platform. Our mission is to make learning and teaching cybersecurity easier through gamified security exercises and challenges. In just a handful of years,...

Contract Senior Java Developer – Data/MarketmakingOutside IR35 (6 month rolling) In office – City of LondonQuant Capital is hiring for a small, high-performing market maker in London.If you are interested in applying for this job, please make sure you meet the following requirements as listed below.This is a junior-to-mid role focused primarily on Java...

Elsevier is seeking a software engineer to design, develop, test, and deploy cloud-hosted web applications. You will collaborate with an Agile cross-functional team to turn complex requirements into user-focused solutions and continuously improve engineering practices.The role emphasizes modern tech like Java, JavaScript/TypeScript, React/Angular, and TDD...

RedRock Consulting Ltd seeks an experienced senior full-stack contractor to own end‑to‑end features across the stack. You will craft React/TypeScript front ends, design Python/FastAPI or Node.js back ends, and shape data with SQL/NoSQL stores while ensuring secure, well-tested code.You’ll ship via GitHub Actions CI/CD, run in containerised...

JPMorgan Chase is seeking a Senior Lead Full Stack Software Engineer within Cybersecurity and Technology Controls. You will lead a team delivering scalable front-end and back-end solutions, mentor engineers, and drive best practices across UI/UX and data pipelines.You will collaborate with product, design, and backend teams to ensure robust, secure software...

A fast-growing cybersecurity training platform is seeking a Senior Full Stack Engineer to develop features for millions of learners. This role involves maintaining existing code and collaborating with a cross-functional team. Responsibilities include designing reliable software solutions, mentoring developers, and monitoring system performance. Ideal...

Portal Biotech Limited in London is hiring two Senior Full-Stack Software Engineers to join the Analysis Platform team. You will design and build backend services, UI and deployment infrastructure powering analyses, runs and reports from our sequencing platform.You will work on data analysis workflows, collaborate with React front-end developers, and...

IFS is seeking a Senior Full Stack Engineer to shape and deliver scalable, cloud-based Industrial AI solutions that create meaningful outcomes for customers and the business. You will provide technical leadership across front-end and back-end, influence architectural decisions, and help evolve the platform into a secure, observable product portfolio.You will...

Reelables in London (N1, hybrid) is hiring a Full Stack Engineer to join our product engineering team. You’ll work across the stack, delivering customer-facing features end-to-end—from intuitive user interfaces to APIs and data models that power real-time tracking.You’ll own features, collaborate with customers to translate operational needs into...

A leading technological organization is hiring a Senior Fullstack Engineer with a backend focus to join their remote team. This role involves core product engineering on the Feeld mobile app and backend systems, requiring extensive backend development experience with TypeScript and AWS technologies. The company promotes an inclusive work culture, offering...

Plexus Resource Solutions Ltd is seeking a Senior Full Stack Developer to build web and mobile apps, demos and developer tools. You’ll take ideas from brief to deployment, collaborating with engineers, product and partners to turn complex tech into user-friendly products.The role is fully remote with a base salary up to $150k USD annually and equity. 5+...

Ares Management in London seeks an experienced Senior Full Stack Engineer to design, develop, and deliver technology solutions powering the firm’s credit investment platform. You will work closely with Credit Engineering and Investment teams to build scalable applications, APIs, and data services, applying modern full-stack practices, cloud-native...

Fireblocks is building the backbone of on-chain access for high‑value transactions across multiple blockchain networks. You will design and deploy scalable backend services, own API components, and drive DeFi protocol integrations.You should bring 7+ years in backend or full‑stack roles, strong Web3 knowledge, and a passion for secure, reliable systems....

Taktile is hiring a Full-Stack Engineer to build features across the AI agent platform, from the backend runtime to the frontend UX. You will work with Python (FastAPI) on AWS serverless, and React/TypeScript on the frontend, delivering production features and improving reliability.The role is hybrid, requiring at least 3 days per week in London, Berlin, or...

Architect and ship resilient cloud-native applications for European clients with strict GDPR privacy, high performance, and modern web frameworks.As Senior Full-Stack Cloud Engineer in London (Shoreditch / Remote UK), you will work closely with our European client roster. You will build highly scalable web systems using modern TypeScript, React, and...

IFS is seeking a Senior Full Stack Engineer to shape and deliver scalable, cloud-based IndustrialAI solutions. You will provide technical leadership across front-end and back-end, influence architecture, and evolve the platform into a secure, observable product portfolio.You will work across GoLang and React, mentor engineers, and champion DevOps, testing,...